Web-injection system



S. KILCHENMANN.

FUEL INJECTHJN SYSTEM.

APPLiCATIDN FILED FEB. 12. ISIS).

fifig, Patented Nov. 4, 1919.

SAMUEL KILCHENMANN, OF WINTERTI-IUR, SWITZERLAND, ASSIGNOR TO BUSGH- SULZER BROS.-DIESEL ENGINE COMPANY, OF ST. LOUISfMISSOURI, A CORPORA- TION OF MISSOURI.

FUEL-INJECTION SYSTEM.

Application filed February 121919.

To calla/7mm. it may concern lle it known that I. SAMUEL ICILFHEN- .nvxx engineer, a citizen of the Republic of Switzerlaml, residing at \Vintertluu. Switzerland, have invented the following-dcscribed lnqn'ovements in Ihuellnjection Systems.

The invention concerns apparatus for supplyinghigh pressm-e air for liquid fuel in- 10 jection in Diesel and other types of engines and consists in theorganization of means as herein described and claimed whereby the air flask in the injection line. it depleted in pressure, an be repleuisluid by "the action o'l the engine without delay either to the starting of the engine or putting under toad when started and whereby also the work to be done by the compressor may be reduced during the starting period oi the engine. Such air [laslis are commonly iii-I terposed in or connected to the injection air line between the compressor and the injeo tion or the] valve, serving as accumulators therein and they also normally afford a sullieient reserve pressure to take care of injection oi the engine is being started under normal condi tious and while the compressor is building up. hen. :1 tier the lapse of a considerable standby period such aflask. from leakage or otluirwise, falls below the pressure necessary for injection it frequently happens that the engine cannot be started at all or until the pressure, is in some way raised or restored, and independent compressor plants and other cxpedicnts are connnonly resorted to in such emergency. The present invention eliminates this difficulty by providing a shut-off connection between the flask and the high pressure injection line and a special connection between the same and the regular air compressor of the engine which can be set or adjusted in such manner as to replenish the flask whilethe compressor delivers injection air of a suflicicnt pressure direct to the fuel valves. These connections are also in the preferred form, mechanically correlated so that they automatically function by the manipulation ofa single member or handle.

The drawing is a diagrammatic, illustraof the preferred arrangement of the connections.

Specification of Letters Patent.-

initial ituel charges when the.

Patented Nor. at, 1919. Serial No. 276,593.

Two cylinders of an internal combustion engine are shown with their fuel injection valves 1 connected by a pipe line 2 to the outlet valve chamber 3 of the. high pressure stage of a nuilti-stage compressor, the latter being indicated as driven from the engine crankshaft. The low pressure stage of the compressor takes air from the atmosphere through entrance -l'and delivers it through the interstage receiver 5 (usually warer-coolml) and through the pine e to the inlet valve 7 of the high pressuie. stage in the usual way. The air flask S is provided with one connection 9 to the high pressure line 2 and anotl n. 10, to the said inter-stage receive and the two connections are conjointly controlled by valve members indicated at 11 and 12 respectively which valve members arejoined to work in unison by a connecting rod 1?). the end of which may be regarded as an operatingmember or handle by means valve means in-both connections may be cciucidently operated to open one and close the other. In the nornial use of the engine. including occasional stopping and starting, the connection 9 is open and 10 is closed so that the flask serves its normal and customary function as accumulator and reservoir. That is tqsay. it is in open communication with the hig'h pressure line. receiving air therefrom or delivering air thereto as the case may be. in accoiumoda-tion tothe ordinary fh'ictnations of the injection air. When so connected the flask the same though it were connected in series relation .with the pipe sections which connect the high pressure stage of the pump to the. injection valves. In such use. the full delivery of the low pressure stage of the compressor passes through the receiver 5 and. pipe 6 to the high pressure. stage. hen however the flask has bOCOlllCdlGPlBtGCl. to a less pressure than is suitable for fuel injection the rod 13 is moved to the. position indicated in the drawing which isolates the flask from the high pressure line and connects it to the compressor to receive air from the low pressure stage thereof; for example, from the receiver 5 from which source the flask is gradually restored until it may be again connected t the high pressure injection line.

or a two-stage air of which thefunctions quite through the connection 10, air at sufficient pressure is also delivered from the receiver to the high pressure stage of the compressor and suflicieut to produce an adequate injection air pressure in the 'fuel valves. At the end oi the recharging operation, indicated bypressure gages, placed 'where needed but not shown in the drawing, the rod 13 is. slowly moved in the direction to open the valve 11 and thereby equalize the pressures in the pipe 2 and in the flask, whereupon the engine will proceed under i'ull normal conditions. 1

It will be observed that inasmuch as there is little or no load on the engine when being started, a correspondingly small amount of fuel is required for injection and a correspondingly small volume, or low pressure, of air is requisite for the purpose. Therefore, when the valves 11 and 12 are set as indicated in the diagram andsome air is diverted through 10 to the air flask the corresponding dilninislunent of high pressure delivery coincides more or less exactly with the engine requirements. This represents an economy of energy for if the full volume should. be delivered to the fuel valves on such occasions it would be Without any beneiit to the operation. as the pressure in the air flask rises, the high pressure air Will also tend to increase in pressure, for obvious reasons, so that by the closure of valve 12 and opi'ining oi valve 11 a gradual transitron to the normal condition can be read1ly accomplished, the air flask being thusrewith the operation oi the powe plant as a Whole.

The mechanical designer will readily produce the connections and controls as above explained, in compact mechanical form in volving the minimum pipe connections and compressor to he. indcpendentl', charged thereby.

2. In a fuel injection air system, the combination ofa multistage engine compressor, an injection air line connecting the high pressure stage thereof to a 'fuel valve and also to an air flask and means for isolating the flask from the fuel valve andconnecting. the same to the compressor between the stages thereof.

3. -In a fuel. 'njeetion air system, the C0111- bination of an air flaskhaving connections to an injection air line and to an engine coinpressor to be charged thereby and valve means in each connection adapted for coincidently and alternately opening one connection and ClQSlllg the other.

In testimony Wiereof, I have signed this specification.

SAMUEL KILCHENMANN. 

